Unable to execute command inside double square brackets inside my Makefile - makefile

Question

clean:
#for container_name in ${NEW_DJANGO_IMAGE_NAME} \
${NEW_MSQL_IMAGE_NAME} \
${NEW_NGINX_IMAGE_NAME} \
${NEW_REDIS_IMAGE_NAME}; \
do if [[ 'a' == 'a' ]]; then echo 'fdfdf'; fi; done;
If I do something like this it works. Now instead of this silly line
do if [[ 'a' == 'a' ]]; then echo 'fdfdf'; fi; done;
I want to write the following:
do if [[ docker ps --filter "name=^/$$container_name$$" --format '{{.Names}}' == $$container_name ]]; then echo 'fdfdf'; fi; done;
The idea is that I iterate over a number of docker containers and if it happens that some of them are running I want to stop them. So in the place of echo 'fdfdf' I want to see this line: docker container stop <CONTAINER_NAME>;
Looks as simple as hell but I can't get it to work in the Makefile...What am I doing wrong?

Answer 1

You apparently think that [[ cmd == "string" ]] executes cmd before performing the test. This is not the case. Use:
[[ `cmd` == "string" ]]
instead. In your case it would look like this:
do if [[ `docker ps --filter "name=^/$$container_name$$" --format '{{.Names}}'` == $$container_name ]]; then docker container stop $$container_name; fi; done;
Or, a bit more readable, maybe:
IMAGES := $(NEW_DJANGO_IMAGE_NAME) $(NEW_MSQL_IMAGE_NAME) \
$(NEW_NGINX_IMAGE_NAME) $(NEW_REDIS_IMAGE_NAME)
clean:
#for cn in $(IMAGES); do \
tmp=`docker ps --filter "name=^/$$cn$$" --format '{{.Names}}'`; \
if [ -n "$$tmp" ]; then \
docker container stop $$cn; \
fi; \
done
Note that, in this last version, we use the bourne shell test commmand ([) instead of the bash-only conditional expression ([[...]]).